Pipe-wrench.



PATENTED MAY 26, 1903.

J. 'DONALDSON. PIPE WRENCH. APPLIGATION FILED SEPT. a, 19.02.

H0 MODEL.

' UNITED STATES Patented May 26, 1903.

PATENT OEEICE.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 728,881, dated May26,1903. Application filed September 8, 1902. Serial No. 122,457. (Nomodel.)

To all whmn it may concern.-

Be it known that I, JOHN DONALDSON, of

The object of the invention is to provide an improved device of thischaracter having the movable jaw so constructed that it may oscillaterelatively to the fixed jaw and in the same plane therewith, means beingprovided whereby the movable jaw in its direction of oscillationimparted by the application of the wrench to a pipe or other object toturn it will approach the fixed jaw.

To these ends the invention consists in the construction and arrangementof parts, substantially as hereinafter described and claimed. v

Of the accompanying drawings, Figure 1 represents a side' elevation of awrench embodying my improvements. Fig. 2 represents a longitudinalsectional view of the same with the movable jaw in its extreme clampingposition.

Similar reference characters indicate similar parts throughout theseveral views.

The handle of the wrench is represented at 5 and is provided with afixed jaw 6, which maybe smooth or serrated. Rising from the top of thehandle adjacent to the jaw portion is a guide projection 7, which is ofa more or less common form, said projection preferably having a lateralopening for the play of the nut, hereinafter described. Extendingthrough a longitudinal opening in the guide projection 7 is the threadedshank 9 of the movable jaw 8, which latter jaw may also be smooth orserrated. Within the lateral opening of the guide projection 7 is a nut10, fitting the threaded shank of the movable jaw. As so far describedthe construction more or less closely resembles a well-known type ofpipe-wrench.

In carrying out my invention I make the longitudinal opening in theguide projection A 7 sufficiently large to permit the threaded shank ofthe movable jaw to oscillate therein, and the said guide projection isformed with an inclined or beveled face I) at the lower end of the flatbearing-face a. I preferably interpose between the nut 10 and the face aa plate or washer 0, having a beveled or inclined lower edge (1, adaptedto coact with the inclined or beveled face 6, as presently described.

In the operation of the wrench it is applied to a pipe, (indicatedconventionally at w,) as represented in Fig. 1, the nut 10 being set upsufiiciently to cause the pipe to be grasped between the two jaws.Thereupon a move ment of .the handle 5 in the direction of the 'arrow inFig. 1 causes the parts to move toward the position shown in Fig. 2,during which movement the threaded shank of the movable jaw oscillatesin the longitudinal opening of the guide projection 7, so that theinclined or beveled edge 01 of the plate or washer c rides down thebeveled bearing-face I), thus drawing the movable jaw toward the fixedjaw, as clearly indicated in Fig. 2, thereby causing an exceedinglyclose bite on the pipe or other cylindrical object which is beingoperated upon.

I do not limit myself to the employment of the plate or washer 0, since,as is obvious, the lower edge of the nut 10 may bear against theinclined face I); but inasmuch as this would tend to unduly wear theedge of the nut I preferably employ the said plate or washer c, thelower beveled edge of which forms an extended bearing to take up thewear against the inclined bearing-face b.

It will be seen that I have provided a construction in which the fulcrummoves along an inclined surface so as to increase the bite the fartherthe fulcrum moves along said inclined surface. It will also be observedthat the faces of the jaws are shown as inclined as well as serrated.tion, as it cooperates with the inclined faces I) and d in grasping theobject to be operated upon.

If the plate or washer c is omitted and the nut alone relied upon tobear against the faces a and b, I preferably bevel one edge of the nut,as indicated at 10. When the nut is to I prefer this construe be soused, it will be reversed from the position shown in the drawings.

I claim 1; A pipe-wrench comprising a handle having a jaw fixedrelatively thereto and a guide projection, a movable jaw having athreaded shank passing through said guide projection and adapted tooscillate therein, said projection havingaflat bearing-face and aninclined face at the lower end of said flat face, and

means carried by the shank of the movable tion having a flatbearing-face and an inclined face at the lower end of said flat face, anut on the shank of the movable jaw, and a platev interposed between thenut and the flat bearing-face, said plate having a beveled edge tocooperate with the said inclined bearing-face.

3. A pipe-wrench comprising a handle having a jaw fixed relativelythereto, and a guide projection formed with a lateral opening and with alongitudinal opening, a movable jaw having a threaded shank passingthrough the longitudinal opening of the guide projection and adapted tooscillate therein, the said projection having a flat bearing-face at thelower end thereof, a nut located in the lateral opening of the guideprojection and fitted to the shank of the movable jaw, and a flat platemounted on the shank of the movable jaw in front of the nut, said platehaving a beveled lower edge, substantially as and for the purpose setforth.

In testimony whereof I have affixed my signature in presence of twoWitnesses.

JOHN DONALDSON. Witnesses A. W. HARRISON, O. F. BROWN.

